Things can get downright deadly when male kangaroos fight over mating rights. With their gigantic feet, these "boomers" deliver kicks that can crush bone... and ...
Kangaroo Kickboxing | World's Deadliest

Here are 10 modern animals that used to be giants. Even though we're used to animals falling into pretty dependable size ranges, not all of them were always ...
10 Modern Animals That Used To Be Giants